# AIP: ArbOS 31 “Bianca” - Activation of Arbitrum Stylus, RIP-7212 Support, & Nova Fee Router Proposal **URL:** \ **Category:** Finalized AIPs\ **Tags:** proposal\ **Created:** [July 25, 2024, 4:22am UTC](https://forum.arbitrum.foundation/t/aip-arbos-31-bianca-activation-of-arbitrum-stylus-rip-7212-support-nova-fee-router-proposal/25904 "2024-07-25T04:22:02Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![openzeppelin](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.arbitrum.foundation/openzeppelin/32/10623_2.png) [@openzeppelin](https://forum.arbitrum.foundation/u/openzeppelin)\ **Post date:** [July 30, 2024, 11:15pm UTC](https://forum.arbitrum.foundation/t/aip-arbos-31-bianca-activation-of-arbitrum-stylus-rip-7212-support-nova-fee-router-proposal/25904/5 "2024-07-30T23:15:25Z")
# Proposal Review OpenZeppelin, the Security Member of the ARDC, reviewed the [AIP: ArbOS 31 “Bianca” proposal](https://forum.arbitrum.foundation/t/aip-ArbOS-31-bianca-activation-of-arbitrum-stylus-rip-7212-support-nova-fee-router-proposal/25904) and its execution instructions. If enacted, the proposal execution will activate Stylus, Alternate Signature Verification, and Automatic Treasury Deposits using seven on-chain governance action contracts (GACs) that alter the ecosystem in the ways described in the proposal description. The new, on-chain contracts match their audited versions with the exception of the contracts in the [OffchainLabs/fund-distribution-contracts](https://github.com/OffchainLabs/fund-distribution-contracts/compare/61f4f60384e2ecba8250287dfb2778ce30bd82b0...v1.0.1) for fund distribution which were not fully covered by the audit scope and with some files receiving some optimization changes since the final audit commit. We recommend getting a confirmation on whether the latest version of these files were covered in the audit. You may read our full review here: > [@AIP: ArbOS 31 Proposal Review](https://forum.arbitrum.foundation/t/aip-arbos-31-proposal-review/26000): > > AIP: ArbOS 31 Proposal Review Authors: @red-swan, @jbass-ozSummary OpenZeppelin, the Security Member of the ARDC, reviewed the [AIP: ArbOS 31 “Bianca” proposal](https://forum.arbitrum.foundation/t/aip-ArbOS-31-bianca-activation-of-arbitrum-stylus-rip-7212-support-nova-fee-router-proposal/25904) and its execution instructions. If enacted, the proposal execution will activate Stylus, Alternate Signature Verification, and Automatic Treasury Deposits using seven on-chain governance action contracts (GACs) that alter the ecosystem in the ways described in the proposal description. The new, on-chain contracts match their audited vers… --- _[View the full topic](https://forum.arbitrum.foundation/t/aip-arbos-31-bianca-activation-of-arbitrum-stylus-rip-7212-support-nova-fee-router-proposal/25904)._